Oni
First Post
Possibly.
It would be very interesting to see it tried though, even if it has to be by a 3rd party.
There are systems that handle magic in this fashion. Legends of Anglerre, for instance, basically handles going to 0 stress (HP) as losing narrative control. However there it is a lot more nuanced and there are degrees of effect and you can also lay down smaller status conditions as maneuvers. But for something like that to work the system would have to be revised from the ground up, the scaling of HP in D&D is too great. It would require more than an overhaul of the magic system, it would require an overhaul of the entire game system, it would need to be changed on a fundamental level to work IMHO.